chore: add aws-cdk-lib/core to codecov (#32641)

[Example
report](https://app.codecov.io/github/iliapolo/aws-cdk/tree/main/packages%2Faws-cdk-lib?components%5B0%5D=packages%2Faws-cdk-lib%2Fcore)

.github/workflows/codecov.yml

@@ -21,16 +21,22 @@ jobs:
       - name: Install dependencies
         run: yarn install
 
+      - name: Build Library
+        run: npx lerna run build --scope=aws-cdk-lib
+
       - name: Build CLI
         run: npx lerna run build --scope=aws-cdk
 
-      - name: Run tests
+      - name: Run Core tests
+        run: cd packages/aws-cdk-lib && yarn test core
+
+      - name: Run CLI tests
         run: cd packages/aws-cdk && yarn test
 
       - name: Upload results to Codecov
         uses: codecov/codecov-action@v4
         with:
-          directory: packages/aws-cdk/coverage
+          files: packages/aws-cdk/coverage/cobertura-coverage.xml,packages/aws-cdk-lib/coverage/cobertura-coverage.xml
           fail_ci_if_error: true
           flags: suite.unit
           token: ${{ secrets.CODECOV_TOKEN }}

codecov.yml

@@ -9,7 +9,6 @@ coverage:
       default:
         # require the overall patch coverage to be at least 95%
         target: 95
-
 
 # https://docs.codecov.com/docs/codecovyml-reference#comment
 comment:
@@ -26,10 +25,14 @@ component_management:
       - type: patch
         target: 95
   individual_components:
-    - component_id: packages_aws_cdk  # identifier that should not be changed
+    - component_id: packages_aws_cdk # identifier that should not be changed
       name: packages/aws-cdk # display name that can change freely
       paths:
         - packages/aws-cdk/**
+    - component_id: packages_aws_cdk_lib_core # identifier that should not be changed
+      name: packages/aws-cdk-lib/core # display name that can change freely
+      paths:
+        - packages/aws-cdk-lib/core/**
 
 # https://docs.codecov.com/docs/ignoring-paths
 ignore:

packages/aws-cdk-lib/jest.config.js

@@ -8,6 +8,8 @@ module.exports = {
   testMatch: [
     '<rootDir>/**/test/**/?(*.)+(test).ts',
   ],
+  coveragePathIgnorePatterns: ['\\.generated\\.[jt]s$', '<rootDir>/.*/test/', '.warnings.jsii.js$', '/node_modules/'],
+
   // Massive parallellism leads to common timeouts
   testTimeout: 60_000,